Question

Dau coroana la cine respunde, ex 2 va rog

Answer 1

 

$\displaystyle\bf\\\textbf{Ai~scris Ex~2. in text, dar in comentarii ai corectat: Ex. 12.}\\\\Rezolvare~Ex.~12:\\\\a+2b+c=51\\2a+b+2c=42\\\\---------Adunam\\3a+3b+3c=93\\\\3(a+b+c)=93\\\\a+b+c=\frac{93}{3}\\\\\boxed{\bf a+b+c=31 }$